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Ok so this is my folder Structure

So here is the Functions Index File:

const functions = require('firebase-functions')
const express = require('express')
const Nuxt = require('nuxt')

const app = express()

const config = 
 dev: false,
 buildDir: 'nuxt',
 build: 
 publicPath: '/'
 

const nuxt = new Nuxt(config)

function handleRequest (req, res) 
 res.set('Cache-Control', 'public, max-age=600, s-maxage=1200')
 nuxt.renderRoute('/').then(result => 
 res.send(result.html)
 ).catch(e => 
 res.send(e)
 )


app.get('*', handleRequest)
exports.nuxtApp = functions.https.onRequest(app)

But all I get when visiting the Url is ""code":"MODULE_NOT_FOUND"
(after deploying)

All i did in the nuxt.config.js is just telling it to make the build directory into the nuxt folder in the functions folder

firebase.json

 "hosting": 
 "public": "public",
 "ignore": [
 "firebase.json",
 "**/.*",
 "**/node_modules/**"
 ],
 "rewrites": [
 
 "source": "**",
 "function": "nuxtApp"
 
 ]
 

When testing locally with Firebase Serve it works but it only renders the base url / and nothing else and also I have no Static Assets like my scss files or the app manifest.

After a few days of debugging I found a solution.

At first, you have to extend your error logging, so you can see the stack-trace:

console.error(e)
res.send(e)

My errors were:

error#1 firebase package was not installed in my functions folder, so I had to install it with npm install --save firebase in the functions directory. The overall firebase package is not required by Cloud Functions, however it's needed for my nuxt project for firestore usage

error#2 You could get an error like firebaseApp.firestore is not a function. It's due to a wrong import of firebase to you could function. I found the solution for this problem here

I change this import:

import firebase from 'firebase';
import 'firebase/firestore';

To this:

import firebase from '@firebase/app';
import '@firebase/firestore'

After solving these two errors, my NuxtJs app worked well with Firebase Cloud Functions.